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/arch/sparc64/prom/bootstr.c

https://bitbucket.org/evzijst/gittest
C | 40 lines | 25 code | 4 blank | 11 comment | 1 complexity | 2399e715c5d2850ad555cb0adaaca735 MD5 | raw file
 1/* $Id: bootstr.c,v 1.6 1999/08/31 06:55:01 davem Exp $
 2 * bootstr.c:  Boot string/argument acquisition from the PROM.
 3 *
 4 * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
 5 * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 6 */
 7
 8#include <linux/string.h>
 9#include <linux/init.h>
10#include <asm/oplib.h>
11
12/* WARNING: The boot loader knows that these next three variables come one right
13 *          after another in the .data section.  Do not move this stuff into
14 *          the .bss section or it will break things.
15 */
16
17#define BARG_LEN  256
18struct {
19	int bootstr_len;
20	int bootstr_valid;
21	char bootstr_buf[BARG_LEN];
22} bootstr_info = {
23	.bootstr_len = BARG_LEN,
24#ifdef CONFIG_CMDLINE
25	.bootstr_valid = 1,
26	.bootstr_buf = CONFIG_CMDLINE,
27#endif
28};
29
30char * __init
31prom_getbootargs(void)
32{
33	/* This check saves us from a panic when bootfd patches args. */
34	if (bootstr_info.bootstr_valid)
35		return bootstr_info.bootstr_buf;
36	prom_getstring(prom_chosen_node, "bootargs",
37		       bootstr_info.bootstr_buf, BARG_LEN);
38	bootstr_info.bootstr_valid = 1;
39	return bootstr_info.bootstr_buf;
40}